I’ll give it a go if I ever get sick of Brave. What makes it more functional? I love how polished and robust Chromium-based browsers are.

Mainly, I found Brave's settings page to feel very janky. Vivaldi's settings are much more polished and feature rich by comparison. It also has vertical tab support which I now use everywhere, and the E2EE synced sessions is something I use on a daily basis.